Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86075736d55c2b8…

MALICIOUS

PDF

50.2 KB Created: 2021-06-07 21:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0352695d0cb0458c8bf9156fc29f28e8 SHA-1: 8464310e19e1cc84a2d121f3774dfcd8838562d9 SHA-256: b86075736d55c2b8adf01ac39694bd88ac95aafd33dabfde7674d0ad8ba0373e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting free Robux or game hacks. The presence of a visual download button and the overall lure suggest a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead the user to a site that may host further malware or attempt credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/free-robux-https-robuxplanet-com-r-game-hack In PDF document text
    • http://halle-wasserball.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/rbxrewards-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/114-hacks_GM479516143.pdfIn PDF document text
    • http://halle-wasserball.de/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005432.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5432 28784 bytes
SHA-256: 367b727515281652791f80c5a40bde960ff11ec0a0d8bf38adf09db9cbf35568
font_01_sfnt_off0000962e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962E 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE4 18856 bytes
SHA-256: 43861d4994a28e527bb7bf029105e832976cc672a639b71b354cf57baa7a47b8

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